VARIABLE FACTOR OF PRODUCTION: An input whose quantity can be changed in the time period under consideration. This usually goes by the shorter term fixed input and should be immediately compared and contrasted with fixed factor of production, which goes by the shorter term fixed input. The most common example of a variable factor of production is labor. A variable factor of production provides the extra inputs that a firm needs to expand short-run production. In contrast, a fixed factor of production, like capital, provides the capacity constraint in production. As larger quantities of a variable factor of production, like labor, are added to a fixed factor of production like capital, the variable factor of production becomes less productive.

SEASONAL UNEMPLOYMENT: Unemployment is caused by relatively regular and predictable declines in particular industries or occupations over the course of a year, often corresponding with the seasons. Unlike cyclical unemployment, that could occur at any time, seasonal unemployment is an essential part of many jobs. For example, your regular, run-of-the-mill, department store Santa Clause can count on 11 months of unemployment each year. Seasonal unemployment is one of four unemployment sources. The other three are cyclical unemployment, frictional unemployment, and structural unemployment.

A principle stating that monopolistically competitive firms seek to maintain similarities between products at the same time they promote differences. Similarities enable substitutability, such that one firm can attract the buyers away from other firms. Differences enable uniqueness and market control, such that each firm has market control and is able to charge a higher price than achieved with perfect competition. This principle is also termed Hotelling's paradox.

Today, you are likely to spend a great deal of time strolling through a department store looking to buy either income tax software or a how-to book on the art of negotiation. Be on the lookout for attractive cable television service repair people.Your Complete Scope

The first "Black Friday" on record, a friday marked by a major financial catastrophe, occurred on September 24, 1869 -- A FRIDAY -- when an attempted cornering of the gold market induced a financial crises and economy-wide depression.

"How wonderful it is that nobody need wait a single moment before starting to improve the world. "